Posted in 2023

HSM News for Dec 2023

This blog entry is outdated.

Hohoho,

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Changelog slk_helpers v1.10.2

Update from slk_helpers v1.9.7 to v1.10.2

see here for changes from slk_helpers v1.9.5 to v1.9.9

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Changelog slk_helpers v1.9.9

Update from slk_helpers v1.9.7 to v1.9.9

see here for changes from slk_helpers v1.9.3 to v1.9.5

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HSM News for Oct 2023

will be installed in module python3/2023.01-gcc-11.2.0 on Oct 17th

new function pyslk.construct_dst_from_src() which accepts source file(s) and a destination root path is input and constructs the destination path of each source file if it was archived by slk archive

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Changes in pyslk 1.9

updated: 2023-09-18 (removed note)

A major structural change was implemented in pyslk version 1.9.0 compared to older versions. The implementation of this change did start in version 1.7.0 but most parts where implemented in 1.9.0. All functions which are meant to be used by end-users, can be used without specifying the module’s name: pyslk.example_function instead of pyslk.module_name.example_function.

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Changelog slk_helpers v1.9.5

Update from slk_helpers v1.9.3 to v1.9.5

see here for changes from slk_helpers v1.9.0 to v1.9.3

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Changelog slk_helpers v1.9.3

Update from slk_helpers v1.9.0 to v1.9.3

see here for changes from slk_helpers v1.8.10 to v1.9.0

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Changelog slk_helpers v1.9.0

Update from slk_helpers v1.8.10 to v1.9.0

see here for changes from slk_helpers v1.8.2 to v1.8.10

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Important news for slk usage

Please do not retrieve files from more than 10 tapes with one call of slk retrieve / recall. Using more tapes in one call of slk retrieve might slow down the whole StrongLink System considerably.

First, count the number of tapes as follows:

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Changelog slk_helpers v1.8.10

Update from slk_helpers v1.8.2 to v1.8.10

see here for changes from slk_helpers v1.7.4 to v1.8.2

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Changelog slk_helpers v1.8.7

Update from slk_helpers v1.8.2 to v1.8.7

see here for changes from slk_helpers v1.7.4 to v1.7.4

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Changelog slk v3.3.91

Changes from slk v3.3.88 to v3.3.91

see here for changes from

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OpenSSH Certificate Authentication

It is very convenient to allocate part of a node ore even a full node for interactive work on Levante. We describe how to do this in our main documentation.

If you always use a login node of Levante to log into the allocated node, then you won’t have any problems with host keys. However, if you use a login node as a jump host for loging into the allocated node from your local machine, then you may see a warning.

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Changelog slk_helpers v1.8.2

Update from slk_helpers v1.7.4 to v1.8.2

see here for changes from slk_helpers v1.7.1 to v1.7.4

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Changelog slk v3.3.88

Changes from slk v3.3.83 to v3.3.88

see here for changes from

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Set up Remote Developement/Debugging

Some workarounds related to remote development/debugging on Levante. These workarounds are not tested on all available remote tools but often specific to a certain IDE. We encourage you to test on your favorite IDE and report issues to support@dkrz.de.

Tested on VSCode

../_images/vscode_token.png

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Changelog slk_helpers v1.7.4

Update from slk_helpers v1.7.1 to v1.7.4

see here for changes from slk_helpers v1.6.0 to v1.7.1

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Changelog slk v3.3.83

Changes from slk v3.3.81 to v3.3.83

see here for changes from slk v3.3.76 to v3.3.81

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E-Mail notification when login token due to expire

As suggested by the DKRZ-Usergroup there is now the possibility to remind users when their token is due to expire. We provide a SLURM script for this purpose. The 30-day validity of the login token remains unchanged. Details are given in Reminder login token expires.

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How can I log into levante, change my password and login shell?

To access Levante login nodes via ssh with X11 forwarding, use:

For macOS we recommend to use -Y instead of the -X option.

luv_user_account_menu_icon

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I want to add my own packages to Python or R but they won’t compile

Python and R, among other scripting languages, allow users to create customized environments including their own set of packages.

For Python you use virtualenv or conda, R can also add locally installed packages.

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Which Compiler and MPI library should I use?

For model simulations in production mode we recommend to use Intel compilers and Open MPI:

Do not forget to consult the recommended environment settings and adjust your run script accordingly. Without these settings applications can run unexpectedly slowly.

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How do I log into the same login node I used before

levante.dkrz.de maps to a whole group of nodes to distribute the load:

All login nodes share the same file system so most of the time you do not have to care which node you are on. However, there are reasons why you may want to connect to a specific node (for example, to reattach to a running tmux session). You first have to find out on which node you are. This may be indicated in your prompt or you can also use hostname for this purpose:

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Changelog slk_helpers v1.7.1

Please use slk_helpers version 1.7.2 (module load slk_helpers/1.7.2) instead of 1.7.1 because one minor issue was fixed in 1.7.2 (detailed changelog). There will be no extra blog entry for slk_helpers 1.7.2.

Update from slk_helpers v1.6.0 to v1.7.1

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Changelog slk v3.3.81

Changes from slk v3.3.76 to v3.3.81

slk retrieve and slk recall print the id of the StrongLink-internal tape-recall job

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